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A multitude of options exists to protect, preserve and display exposed archaeological sites; each suggests certain advantages and disadvantages.
Soft capping replaces hard caps with vegetation planted on top of layers of soil, gravel, and geosynthetics. The idea is to prevent water penetration and to reduce thermal fluctuations by taking advantage of plants' abilities to utilize the water and provide a protective barrier on the wall top. The concept is very similar to green roof technology that has gained increased popularity in recent years.